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A pharyngeal puch that is between the pharyngeal arches 2 and 3. [ https://www.worldcat.org/search?q=bn%3A0124020607 http://www.ncbi.nlm.nih.gov/pubmed/16313389 ]

Synonyms: second visceral pouch 2nd arch branchial pouch endoderm pharyngeal pouches 2 2nd pharyngeal pouch endoderm second arch pharyngeal pouch visceral pouch 2 2nd branchial pouch 2nd arch branchial pouch 2nd arch pouch endoderm

This is just here as a test because I lose it

Term information

database cross reference

efo_slim, pheno_slim, vertebrate_core

plural term
pharyngeal pouches 2 [ ZFA:0001130 ]

development notes

Contributes to the middle ear, epithelial lining of Crypts (spaces) of the palatine tonsils, supplied by the facial nerve

external definition

Second of the pharyngeal (endodermal) evaginations between the visceral arches from which the Eustachian tube is derived; pouches 2-4 open as gill slits.[AAO]

A pouch that is situated between the 2nd and 3rd pharyngeal arch. [ISBN:0124020607][VHOG]

has alternative id


has related synonym

second pharyngeal pouch

homology notes

A conserved feature of all vertebrate embryos is the presence of a series of bulges on the lateral surface of the head, the pharyngeal arches; it is within these structures that the nerves, muscles and skeletal components of the pharyngeal apparatus are laid down. The pharyngeal arches are separated by endodermal outpocketings, the pharyngeal pouches.[well established][VHOG]



taxon notes

the dorsal elongation of the second pouch endoderm of all mammals, with the exception of rodents, gives rise to the epithelial lining of palatine tonsils; in rodents, the ventral portion of the second pouch appears to degenerate whereas the remaining part is incorporated into the lateral border of the pharynx; it appears that rodents no longer require tonsils as their function is carried out by the NALT (Nose/Nasal-Associated Lymphoid Tissue) system in the upper respiratory tract.